![]() Dolby Digital is mainly used in cinema and DVD applications. The sixth channel uses one-tenth of the bandwidth and produces the audio sent to the subwoofer. ![]() These supply audio to the center, front-left, front-right, rear-left and rear-right speakers. The first five channels are full-bandwidth channels capable of producing sounds in the 20 to 20,000 Hz range. An AC3 file allows up to six channels of audio in a 5.1 configuration. One advantage of using lossy compression is that AC3 files take up less storage space. AC-3 codec uses modified discrete cosine transform algorithm (MDCT), so AC3 files are lossy-compressed. An AC3 file contains digital audio saved in Dolby Digital file format using its AC-3 (Audio Codec 3, Advanced Codec 3, and/or Acoustic Coder 3) audio compression standard. ![]() AC3 files mostly belong to QuickTime by Apple.
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